1213415616 has 168 divisors, whose sum is σ = 3774588336. Its totient is φ = 342988800.

The previous prime is 1213415611. The next prime is 1213415617. The reversal of 1213415616 is 6165143121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (168).

It is not an unprimeable number, because it can be changed into a prime (1213415611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 949570 + ... + 950846.

Almost surely, 2^1213415616 is an apocalyptic number.

1213415616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213415616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1887294168).

1213415616 is an abundant number, since it is smaller than the sum of its proper divisors (2561172720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213415616 is a wasteful number, since it uses less digits than its factorization.

1213415616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407 (or 1390 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 1213415616 is about 34834.1156913736. The cubic root of 1213415616 is about 1066.6039636752.

Adding to 1213415616 its reverse (6165143121), we get a palindrome (7378558737).

The spelling of 1213415616 in words is "one billion, two hundred thirteen million, four hundred fifteen thousand, six hundred sixteen".